Jiahui Peng

Publications (10) View all

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  Available from: Jiahui Peng

  Article: Control of energy deposition in femtosecond laser dielectric interactions

  Jiahui Peng, David Grojo, David M. Rayner, Paul B. Corkum
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  ABSTRACT: There are natural limits to the spatial resolution and the deposited energy densities that can be achieved in femtosecond laser dielectric modification. These arise because of the threshold-like nature of nonlinear absorption. We use two-pulse experiments to show that both limits can be exceeded by taking advantage of absorption seeded by free electrons or self-trapped excitons, depending on the pulse separation.
  Applied Physics Letters 04/2013; · 3.84 Impact Factor
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  Available from: Jiahui Peng

  Article: High-pressure gas phase femtosecond laser ionization mass spectrometry.

  Jiahui Peng, Noah Puskas, Paul B Corkum, David M Rayner, Alexandre V Loboda
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  ABSTRACT: We describe a novel ion source for analytical mass spectrometry based on femtosecond laser ionization at pressures at and above atmospheric and characterize its performance when coupled to a tandem quadrupole/time-of-flight mass spectrometer. We assess source saturation limits, ionization and sampling efficiencies, the effective ionization volume, and limits of detection. We demonstrate 100% efficient ionization for a set of organic compounds and show that the degree of ion fragmentation over a range of laser powers is favorable compared to electron impact ionization, especially in that a substantial parent ion signal is always observed. We show how collisional cooling plays a role in controlling fragmentation at high pressures and address how ion-molecule chemistry can be controlled or exploited. High-pressure femtosecond laser ionization will allow "universal" and efficient ionization, presenting a research direction that will broaden the options for gas phase analysis beyond the capabilities of electron impact ionization.
  Analytical Chemistry 05/2012; 84(13):5633-40. · 5.86 Impact Factor
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  Article: Carrier-envelope offset frequency measurement for tunable femtosecond lasers using resonant dispersive waves.

  Jiahui Peng, Feng Zhu, Fetah Benabid, Alexei V Sokolov
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  ABSTRACT: We report that carrier-envelope offset frequency measurement for tunable femtosecond lasers is fulfilled by directly using the resonant dispersive waves generated in a photonic crystal fiber.
  Optics Letters 03/2011; 36(6):891-3. · 3.40 Impact Factor
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  Article: Widely tunable femtosecond solitonic radiation in photonic crystal fiber cladding

  Jiahui Peng, Alexei V. Sokolov, F. Benabid, F. Biancalana, P. S. Light, F. Couny, P. J. Roberts
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  ABSTRACT: We report on a means to generate tunable ultrashort optical pulses. We demonstrate that dispersive waves generated by solitons within the small-core features of a photonic crystal fiber cladding can be used to obtain femtosecond pulses tunable over an octave-wide spectral range. The generation process is highly efficient and occurs at the relatively low laser powers available from a simple Ti:sapphire laser oscillator. The described phenomenon is general and will play an important role in other systems where solitons are known to exist.
  Physical Review A 03/2010; 81:031803(R). · 2.88 Impact Factor
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  Article: Simple setup for hybrid coherent Raman microspectroscopy

  Jiahui Peng, Dmitry Pestov, Marlan O. Scully, Alexei V. Sokolov
  Journal of Raman Spectroscopy 02/2009; · 3.09 Impact Factor